Battery charger



FIG. 1 is a perspective view of a battery charger, showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings are for the purpose of illustrating portions of the battery charger that form no part of the claimed design. 

CLAIM The ornamental design for a battery charger, as shown and described. 